Penile Prosthesis Implantation
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Direct answer
A penile prosthesis is the definitive surgical treatment for erectile dysfunction that fails to respond to phosphodiesterase-5 inhibitors, intracavernosal injections and vacuum devices. Two families exist: malleable (semirigid) rods, which are simple, cheap and mechanically near-indestructible, and inflatable devices — the three-piece (cylinders, scrotal pump, abdominal reservoir) producing the most natural erection and best flaccidity. Patient satisfaction in modern series runs high (commonly quoted around 85-95 per cent with three-piece devices), with infection in the order of 1-3 per cent and erosion a particular risk in diabetics and insensate patients; the device is activated about six weeks after implantation.
What you must remember
- Implantation is third-line: after lifestyle and risk-factor correction, PDE5 inhibitors, intraurethral/intracavernosal prostaglandin and vacuum therapy.
- Best indications include ED after radical prostatectomy, cavernosal fibrosis from priapism or Peyronie disease, and diabetes with refractory ED.
- Malleable devices: cheaper, single operation, easy to use for elderly or less dexterous patients; downside is a permanently rigid penis that may be difficult to conceal.
- Three-piece inflatable: cylinders in the corpora, pump in the scrotum, fluid reservoir in the preperitoneal space; best flaccidity and cosmesis; more mechanical parts.
- Infection occurs in roughly 1-3 per cent of primary implants (higher in diabetics and revisions); presents with pain, fever and later erosion; antibiotics alone do not salvage an infected device.
- Erosion risk rises with impaired sensation (spinal cord injury), diabetes, chronic catheterisation and oversized cylinders.
- Infection management options include removal, and in selected early infections, the Mulcahy salvage washout protocol with immediate reimplantation.
- The prosthesis restores rigidity only — it does not create desire, affect ejaculation or orgasm, or restore lost length; counselling on all four is standard consent.
A typical case, counselled properly
A 62-year-old diabetic, six years after radical prostatectomy, has stopped responding to maximal medical therapy; he has tried injections but gives up because of pain. Work-up confirms vasculogenic ED with intact libido; his partner is supportive. The consultation covers, in order: what the device cannot do (no change in desire or orgasm, ejaculation remains as it is post-prostatectomy, and the penis will be no longer than the current stretched length, often slightly shorter), then what each device offers. If he is dexterous and wants normality, a three-piece inflatable fits; if he wants simplicity or cost matters — a genuine consideration in Indian practice — a malleable device serves reliably.
Perioperatively: urine infection is excluded and treated, glycaemia optimised, and a short operative-time, no-touch or modified technique with prophylactic antibiotics reduces infection. Postoperatively, the patient is taught to keep the cylinders deflated for healing, with activation and training at about six weeks. If he later presents with a tender, erythematous scrotum and fever, the assumption is device infection: imaging and exploration follow, because a biofilm-infected prosthesis is not cured by antibiotics. Early infection without extensive tissue loss may be managed by the Mulcahy salvage — removal of all prosthetic material, serial antiseptic washouts and immediate reinsertment — successful in a good proportion of carefully selected patients; late or eroding devices come out and reimplantation is deferred.
Where students slip
The examinable confusions are three. First, "prosthesis cures ED" — it replaces rigidity mechanically; desire, orgasm and ejaculation live elsewhere, and overselling is a consent failure. Second, treating an infected implant with prolonged antibiotics — an infected prosthesis is a surgical problem, like an infected hip replacement. Third, forgetting the special situations: after priapism with fibrosis, cylinders may need corporal reconstruction; in spinal cord injury, insensate skin and bacteriuria raise erosion and infection so malleable devices are sometimes preferred; and a crossed septum or urethral injury during dilation are the operative complications examiners ask about by name.
Frequently asked questions
When is a penile prosthesis indicated?
When erectile dysfunction fails adequate trials of oral, injectable and vacuum therapy, or when fibrosis (post-priapism, Peyronie disease) makes other options futile.
What are the two main types of penile prosthesis?
Malleable (semirigid) paired rods, simple and reliable; and inflatable devices — two-piece or three-piece — offering the most natural rigidity and flaccidity via a scrotal pump and fluid reservoir.
What is the infection rate and how is an infected prosthesis managed?
Around 1-3 per cent for primary implants. Antibiotics alone do not salvage; management is surgical, with removal, or Mulcahy salvage washout with immediate reimplantation in selected early infections.
When is the device activated after surgery?
About six weeks after implantation, once healing is complete, with training in cycling the pump — although specific protocols vary by centre and device.
Does a penile prosthesis restore ejaculation and libido?
No. It provides mechanical rigidity only; libido, orgasm and ejaculation depend on separate neural and hormonal pathways and are unaffected by the implant.